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Byju's Answer

Standard XII

Chemistry

Reducing Nature (Group 2)

A metal A was...

Question

A metal (A) was dissolved in hot 1 : 1 $H N O_{3}$ solution. The solution was evaporated and half white crystals of B are obtained. The solution of B gave a brick red precipitate with $K_{2} C r O_{4}$ and a yellow precipitate with KI. The metal when melted and cooled showed the phenomenon of spitting.

To the solution of B, addition of NaOH gives a brown precipitate. The brown precipitate on strong heating gives

N O_{2}

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N O

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N_{2}

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O_{2}

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Solution

The correct option is D $O_{2}$
$A g A \frac{1 : 1}{H N O_{3} C o n c .} A g N O_{3} B N a O H - --- \to A g_{2} O A g_{2} O \to Δ 2 A g + O_{2} ↑$

$A g N O_{3} + K_{2} C r O_{4} \to A g_{2} C r O_{4} (r e d)$

$A g N O_{3} + K I \to A g I (y e l l o w)$

Suggest Corrections

Similar questions

Q. A metal (A) was dissolved in hot 1 : 1

H N O_{3}

solution. The solution was evaporated and half white crystals of B are obtained. The solution of B gave a brick red precipitate with

K_{2} C r O_{4}

and a reddish yellow precipitate with

K I

. The metal when melted and cooled showed the phenomenon of spitting

To the solution of B, add excess of

N H_{4} O H

followed by glucose solution. The solution is heated over a hot water both. This gives:

Q. A metal (A) was dissolved in hot 1 : 1

H N O_{3}

solution. The solution was evaporated and half white crystals of B are obtained. The solution of B gave a brick red precipitate with

K_{2} C r O_{4}

and a reddish yellow precipitate with

K I

. The metal when melted and cooled showed the phenomenon of spitting

To the solution of B, add excess of

N H_{4} O H

followed by glucose solution. The solution is heated over a hot water both. This gives:

Q. A colourless aqueous solution contain nitrates of two metal, when it is added to an aqueous solution of

N a C l

, a white precipitate ws formed. This precipitate was found to be partially soluble in hot water to give a residue

P

and a solution

Q

. The residue

P

was solublein aq. in

N H_{3}

and also in excess sodium thiosulfate. The hot solution

Q

gave a yellow precipitate with

K I

. The metals

X

and

Y

, respectively, are:

An aqueous solution of salt (A), gives white crystalline precipitate (B) with NaCl solution. The filtrate gives a black precipitate (C) when

H_{2} S

is passed through it. Compound (B) is dissolves in hot water and the solution gives a yellow precipitate (D) on treating with NaI and cooling. The compound (A) does not give any gas with dilute HCl but liberates reddish brown gas on heating.

Compound (B) is:

Q. The aqueous solution of inorganic compound

(X)

yielded a white precipitate when treated with dilute

H N O_{3}

and

A g N O_{3}

. Another sample of the solution of

(X)

when treated with

N a O H

gave a white precipitate first which dissolved in excess of

N a O H

yielding a colorless solution. When

H_{2} S

gas was passed through that solution a white precipitate was obtained.

Identify the compound

(X)

and give the reactions.

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The correct option is D O2AgA1:1HNO3Conc.AgNO3BNaOH−−−−→Ag2OAg2O→Δ2Ag+O2↑ AgNO3+K2CrO4→Ag2CrO4(red) AgNO3+KI→AgI(yellow)

The correct option is D $O_{2}$
$A g A \frac{1 : 1}{H N O_{3} C o n c .} A g N O_{3} B N a O H - --- \to A g_{2} O A g_{2} O \to Δ 2 A g + O_{2} ↑$

$A g N O_{3} + K_{2} C r O_{4} \to A g_{2} C r O_{4} (r e d)$

$A g N O_{3} + K I \to A g I (y e l l o w)$